/*=========================================================================
 *
 *  Copyright UMC Utrecht and contributors
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef itkGPUCastImageFilter_h
#define itkGPUCastImageFilter_h

#include "itkCastImageFilter.h"
#include "itkSimpleDataObjectDecorator.h"

#include "itkGPUFunctorBase.h"
#include "itkOpenCLKernelManager.h"
#include "itkGPUUnaryFunctorImageFilter.h"

namespace itk
{
/** Create a helper GPU Kernel class for GPUCastImageFilter */
itkGPUKernelClassMacro(GPUCastImageFilterKernel);

/** \class GPUCastImageFilter
 * \brief GPU version of CastImageFilter.
 *
 * \author Denis P. Shamonin and Marius Staring. Division of Image Processing,
 * Department of Radiology, Leiden, The Netherlands
 *
 * \note This work was funded by the Netherlands Organisation for
 * Scientific Research (NWO NRG-2010.02 and NWO 639.021.124).
 *
 * \ingroup GPUCommon
 */
namespace Functor
{
template <typename TInput, typename TOutput>
class ITK_TEMPLATE_EXPORT GPUCast : public GPUFunctorBase
{
public:
  GPUCast() = default;

  ~GPUCast() override = default;

  /** Setup GPU kernel arguments for this functor.
   * Returns current argument index to set additional arguments in the GPU kernel.
   */
  int
  SetGPUKernelArguments(OpenCLKernelManager::Pointer KernelManager, int KernelHandle) override
  {
    return 0;
  }
};

} // end of namespace Functor

/** GPUCastImageFilter class definition */
template <typename TInputImage, typename TOutputImage>
class ITK_EXPORT GPUCastImageFilter
  : public GPUUnaryFunctorImageFilter<
      TInputImage,
      TOutputImage,
      Functor::GPUCast<typename TInputImage::PixelType, typename TOutputImage::PixelType>,
      CastImageFilter<TInputImage, TOutputImage>>
{
public:
  /** Standard class typedefs. */
  typedef GPUCastImageFilter Self;
  typedef GPUUnaryFunctorImageFilter<
    TInputImage,
    TOutputImage,
    Functor::GPUCast<typename TInputImage::PixelType, typename TOutputImage::PixelType>,
    CastImageFilter<TInputImage, TOutputImage>>
                                                     GPUSuperclass;
  typedef CastImageFilter<TInputImage, TOutputImage> CPUSuperclass;
  typedef SmartPointer<Self>                         Pointer;
  typedef SmartPointer<const Self>                   ConstPointer;

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  /** Run-time type information (and related methods). */
  itkTypeMacro(GPUCastImageFilter, GPUUnaryFunctorImageFilter);

  /** Pixel types. */
  typedef typename TInputImage::PixelType  InputPixelType;
  typedef typename TOutputImage::PixelType OutputPixelType;

  /** Type of DataObjects to use for scalar inputs */
  typedef SimpleDataObjectDecorator<InputPixelType> InputPixelObjectType;

protected:
  GPUCastImageFilter();
  ~GPUCastImageFilter() override = default;

  /** Unlike CPU version, GPU version of binary threshold filter is not
  multi-threaded */
  void
  GPUGenerateData(void) override;

private:
  GPUCastImageFilter(const Self &) = delete;
  void
  operator=(const Self &) = delete;
};

} // end of namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkGPUCastImageFilter.hxx"
#endif

#endif /* itkGPUCastImageFilter_h */
